反激式高频环节AC-AC变换器并联技术研究

针对反激式高频环节AC-AC变换器输出容量小的特点,提出并研究了这类变换器多模块主从式并联控制策略.并联控制外环采用输出电压瞬时值反馈,内环取各模块的副边电感电流平均值作为均流控制变量,从而去控制各从变换器的工作,使各从变换器副边电流与主变换器一致,达到并联均流的目的.文中给出了两个变换器模块并联实例,并对其进行了稳态...

Research on Paralleled Flyback Type AC-AC Converters with High Frequency Link

Aiming at the small capacity of flyback type AC-AC converter with high frequency link, a master-slave mode parallel control method is proposed. Transient output voltage feedback is adopted for the outer control loop. The average inductance currents of secondary winding of every converter are sampled for the inner loop to be the average currents, which is used to control the slave converters and ensure the current of secondary winding of slaves equate to the master for current-sharing accomplishment. Taking a two-module parallel for example, its simulation results are given. The results indicate that the paralleled system has some advantages, such as strong adaptability to various loads, better voltage regulation and current-sharing, stable output voltage and rapid dynamic response. This kind of parallel controlling strategy will lay a strong technology foundation for the converters application in higher power capacity conversion.